This has been a night mare and then gets worse everyday

Me and my sons father recently broke up.

During the close of our relationship he slowly but surely started acting different. I’d bring it up and he always assured me everything was ok.

Well now since we’ve broken up he’s been blatantly disrespectful and has said and done some foul things to me since Friday. Idk what to do, I’m kinda just venting.... I’m just an emotional wreck w/a 5 month old baby.